The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 2010
Filed:
Aug. 09, 2007
Applicant:
Takashi Sakoh, Kanagawa, JP;
Inventor:
Takashi Sakoh, Kanagawa, JP;
Assignee:
NEC Electronics Corporation, Kawasaki, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 16/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention solves a problem of the degradation of the long-term reliability of a conventional semiconductor memory device due to early deterioration of a FET included in a reference cell therein. DRAMhas word linesto, word linesand, memory cellstoand a reference cell. Gates of FETsin the memory cellstoare connected to the word linestorespectively. Gates of a FETand a FETin the reference cellare connected to the word linefor readout and the word linefor writing respectively. Here, potentials applied to the word linesandare lower than those applied to the word linesto.